Method of forming can bodies from sheet metal blanks



w. F. PUNTE 2,727AQ3 METHOD OF FORMING CAN BODIES FROM SHEET METAL BLANKS 20, 1954 3 Sheets-Sheet l INVENTOR Dec. 2%), 3955 Filed Aug.

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METHOD OF FORMING CAN BODIES FROM SHEET METAL. BLANKS Filed Aug. 20, 1954 3 Sheets-Sheet 2 INVENTOR BY a waflmm ATTORNEYS PUNTE Dec. 20, 1955 INVENTOR WILL/AM E PUNTE F /6./0 BY M,WMT1W ATTURNIEYS 2,727,483 Patented. Dec. 1:1

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METHOD OF FORMING CAN BODIES FROM SHEET MET-AL 'BLANKS WilliamFaPunte, ChicagoyIlL, assignor to Continental Can Company,Jnc.,INew YorlgN. Y., a corporation of New York Application August-20, 1954, Serial No.4515267 3 Claims. (Cl. 113120) The invention relates to new and useful improvements in a method of forming can bodies from sheet metal blanks.

thereto.

These and other objects will in part be obvious and will in part be hereinaftermore. fully disclosed.

In the drawings:

Figure l is a'plan notched and clipped.

Figure 211's an edge view of the body blank showing the end portions as bent downwardly in the same direction and at right angles to the body blank.

Figure 3 is' an'end view of the formed body with the bent portions brought into intimate contact and extending radially outward from the body wall.

Figure 4 is a view showing diagrammatically the spot welding at spaced intervals of the upstanding portions of the side seam and the welding rolls for spot welding the same.

Figure 5 is a side view of the can body showing the upstanding lapped portions as spot welded at spaced intervals.

Figure 6 is a view cally the horn on which the body is formed into body -view ofthe body blank which is and the presser roll for folding the edges with the angle bar.

Figure 6 is a view on a larger scale showing the welded lapped portions as folded into contact with the forming angle bar.

Figure 7 is a view cally the body horn,

contact with the body wa Figure 7 is an enlarged view of the can body and presser roller showing the edge portions folded into intimate contact with the body Wall.

Figure 8 is a side view of the completed body wall showing a portion of the side scam in longitudinal section.

Figure 9 is a-sectional-view on the line .1'1,.11-of Figure 8. 1

Figure 1:0 isuan enlargedlongitudinal sectional view .of the :side seam showing the solder bond-and one'of the spot welds.

Figure 11 is a view showing a slightly modified .'-form of the invention in projects in part-inwardly of the can body and in part outwardly of the can. body.

The invention relatesto a method of forming can bodies from sheet metal blanks. Ihe method consists inproviding a body blank portions are folded dOWn'tOfin acute angle relative to the body wall. 'At this station there. is an iron 11 which is shaped on its underface at 12 to conform: to thebody wall and on itsupperface it is tapered at 13 to bring the endthen passed through a solder Figure 10 shows a longitudinal view through the finished side seam.

7 V 3 i ln'Figure ll there is shown a slightly different form of the arrangement ofthe side seam relative to the body wall. In this form the body wall during bumping has been offset inwardly so that the seam extends inwardly beyond- -the'inner surfaceofthe' body wall and also outwardly beyond the outer surface of the body wall. Otherwise' the structure is;the same as that described above. The steps of the improved method of making the can body consists in notching the body blank and formin'gthe downwardly projecting portions at each end of the blank while the blank is in the flat. The blank is then shaped about a horn and these downwardly projecting portions are swung upwardly toward each other and brought face to face in intimate contact and extend outwardly radially of the body wall. The next step in the method consists in feeding the blank along a horn and spot welding the'upstanding lapped portions at spaced intervalsQ-f The can body is then fed further along the horn to a station where the welded portions are folded downwardly to an acute angle relative to the body wall, after which the body is fed underneath the presser roll which completes the folding down of the welded portions until they are flat against the body wall and in intimate contact therewith. The body is then passed through a solder bonding machine where solder is applied so that it will sweat inbetween the lapped sections and also inbetween the two lapped sections and the body wall. This solder bond extends from one'end of the side seam to the other. During the forming of the can body theends of the downwardly folded portion 6 are brought into lapped contact relation with the body but inasmuch as the lapped portion '4is shortened by the notching at 3 as shown in Figure 1, there will be only two thicknesses of metal at the ends of the lapped seam, as shown in Figure 8.

It is obvious that minor changes in the steps of the method may be made without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. The method of forming a can body comprising, shaping a sheet metal body blank to provide two seam margins one of which is cut away at each end where the closure ends are to be double seamed to the body, bending the seam margins in the same direction and at right angles to the blank, shaping the body about a horn and placing the bent seam margins face to face to form a lapped seam with the said bent edge portions extending radially outwardly from the body wall, spot welding the radially projecting portions at spaced intervals, folding said welded portions to an acute angle relative to the body wall, bumping said folded edges into intimate contact with the body wall to provide two thicknesses of metal at the positions of the cut away portions and three thicknesses of metal intermediately of said cut away portions, and solder bonding said edge portions to each other and to the body wall.

2. The herein described method of forming a can body which comprises, providing a sheet metalrb ody blank with parallel lap seam' margin's one: extending full length of the blank and one notched away the full lap seam width at each end where closure ends are to be double seamed to the body, shaping the bodyabout a horn with said margins contacting to provide a radially projecting seam having a single thickness adjacent each end and lapped thicknesses between said single thickness end portions, spot welding said lapped thicknesses, folding the spot welded thicknesses over onto an adjacent body wall portion, and solder bonding the 'spotw'elde'd thicknesses together and to said body wall portion to provide a lapped seam having two' solder bonded thicknesses at each end where closure ends are to bedouble seamed to. the body and three solder bonded thicknesses intermediately of said two thickness 'end portions.

3. The method defined in claim 2 wherein the folding of the lapped seam thicknesses onto the adjacent body wall portion is carried out'in' t'wo stages, firstby a partial folding ofthe lapped and radially'pro ecting thicknesses to an acute angle relative to said adjacent body wall portion, and then by bumping the seam structure to bring the lapped thicknesses into: intimate contact with each other and the opposed body wall portion and the endwise extended seam margin portions provided by the end notching into intimate contact'directly with the opposed body wall portion, and wherein the solder bondingis carried out after thus bringing the seam structure components into intimate contact.

References Cited in the fileof this patent UNITED STATES PATENTS 861,242 Edison July 23, 1907 1,542,663 Brenzinger June, 16, 1925 2,156,028 Punte Apr. 25, 1939 FOREIGN PATENTS 305,841 Germany May 30, 1918 

